I'm hoping some of you will take a look at Process. It is at version 2.0.2, and thus should be relatively stable. I like how it constantly syncs tasks with iCal (though there is still some work to be done). They've made great progress over version 1, and there is even greater potential. There is no reason this couldn't be used as a GTD app, with Smart Folders and customizable fields. And tasks can go to iCal if simply assigned a due date (with just a click).

Here it is:
http://www.jumsoft.com/process/

And here is a GoogleGroup (beta) to discuss what you think about it:
http://groups-beta.google.com/group/ProcessTalk